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The Influence of Arm Position on Spinal-Reflexive Excitability of the Flexor Carpi Ulnaris in Healthy Males

Walker, Hannah Rose
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1620392740869134

Abstract Details

2021, Master of Science, University of Toledo, Exercise Science.
Context: The medial elbow accounts for many sport-related injuries, specifically in baseball. The Flexor Carpi Ulnaris (FCU) functions as the primary dynamic stabilizer at the medial elbow to assist the Ulnar Collateral Ligament (UCL), however, there is little research observing the neural response of the FCU. The Hoffmann Reflex (H-Reflex) can measure muscle excitability and motoneuron (MN) recruitment and FCU response with assumed elbow joint capsule stretch from shoulder external rotation (ER). The H-reflex divided by M-Wave, the direct stimulation of motor axons, gives us the H:M ratio describing the proportion of MNs available for use. Objective: To determine the effect of upper extremity position on motoneuron pool excitability (MNPE) of the FCU in healthy males. Design: Descriptive. Setting: Laboratory. Participants: 8 healthy males. Inclusion criteria: recreationally active (Tegner activity scale, greater than 5), age 18-30, current or past history of participation in UE sport, no recent history of UE injury, no history of UE surgery. Exclusion criteria: unable to elicit measurable H-reflex or tolerate stimuli, arm pain (less than 3 VAS), known central or peripheral nerve pathology, prescribed depressants or stimulants. Interventions: level of stretch (neutral, medium, high). All participants completed three measurable trials at each condition. Main Outcome Measures: H:M ratio, maximum H-Reflex, and maximum M-Wave were recorded and analyzed for differences between increasing levels of shoulder ER. Results: A downward, but not significant, trend of H:M [ES = 0.52 (-0.48, 1.52); p = 0.18] with increased shoulder ER and no difference in M-Wave [ES = 0.26 (-0.72, 1.25); p = 0.18]. Significant decrease of H-Reflex from medium to high [ES = 0.44 (-0.56, 1.43); p = 0.05] and neutral to high stretch [ES = 0.51 (-0.49, 1.50); p = 0.05]. Conclusion: There is no significant difference in the MNPE of the FCU with varying positions of shoulder ER. However, there was significant decrease of H-Max between positions.
Hannah Walker, MS, AT, ATC (Other)
Grant Norte, Ph.D., AT, ATC, CSCS (Committee Chair)
David Bazett-Jones, Ph.D., AT, ATC, CSCS (Committee Member)
Amanda Murray, PhD, DPT, PT (Committee Member)
80 p.
Sports Medicine
H-reflex; Flexor Carpi Ulnaris; muscle activation; motoneuron pool excitability; upper extremity;

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Citations

  • Walker, H. R. (2021). The Influence of Arm Position on Spinal-Reflexive Excitability of the Flexor Carpi Ulnaris in Healthy Males [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1620392740869134

    APA Style (7th edition)

  • Walker, Hannah. The Influence of Arm Position on Spinal-Reflexive Excitability of the Flexor Carpi Ulnaris in Healthy Males. 2021. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1620392740869134.

    MLA Style (8th edition)

  • Walker, Hannah. "The Influence of Arm Position on Spinal-Reflexive Excitability of the Flexor Carpi Ulnaris in Healthy Males." Master's thesis, University of Toledo, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1620392740869134

    Chicago Manual of Style (17th edition)

toledo1620392740869134
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This open access ETD is published by University of Toledo and OhioLINK.